Electric sad-iron.



w. A. BRAUN.- ELECTRIC SAD IRON.

APPLICATION FILED OCT. l2, 19.12. Patentd May 11,

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W. A. BRAUN.

ELECTRIC SAD IRON.

APPLIcATloN FILED ocT. l2. 1912.

1,138,841. PatefedMay 11, 1915.

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v APPLICATION FILED 00112. 19|2. 1,138,841 Patented May 11, 1915.

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WILLIAM A. BRAUN, 0F CANAL DOVER, OHIO, ASSIGNOR T0 DOVER MANUFACTURINGCOMPANY, 0F CANAL DOVER, OHIO.

ELECTRIC SAD-IRON.

Specification of Letters Patent.

Patented May 11, 1915.

Application led October A12, 1912. Serial No. 725,362.

T0 all whom. it may concern l Be it known that I, VILLIAM A. BRAUN, acitizen of the United States, residing at Canal Dover, county ofTuscarawas, and State of Ohio, have invented new and useful Improvementsin Electric Sad-Irons, of which the following is a specification.

My'invention relates to improvements in that class of thermo regulatingdevices for which Letters Patent Number 971232 were issued to meNovember 1, 1910. Thile the heat regulating device disclosed in saidpatent is shown and described as being in connection with a sad iron, mypresent improvement is adapted to be used not only in connection withsad irons, but also in connection with soldering irons, lire-lesscookers, heaters, and for a great variety o'lE other purposes.

My invention pertains, first, to the means for adjusting the device forchanging the range of temperature, whereby the predetermined temperaturerequired for a certain duty, will be produced; and second to the heatcontrolling device for automatically cutting out the electric currentthe instant the desiredtemperature is reached, and also forautomatically turning the current on at the Ydesired moment as thetemperature is lowered, whereby a higher or lower uniform temperaturemay be maintained as circumstances or work to be done may require.

It is a well known fact that a much stronger electric current may beproperly used when first heating a cold object than is required tomaintain the required temperature after such object has become heated,and it therefore becomes necessary' after such object is heated, toreduce theelectric current, otherwise such object may become excessivelyheated.

The object of my invention is, therefore, to provide a simple andeiicient means not only for adjusting the device for producing thedesired range of temperature, but also to provide means forautomatically cutting out or turning on the electric current, whereby asteady uniform temperature of the desired Arange may be automaticallymaintained.

My invention is further explained by refvSis erence to the accompanyingdrawings, in which- Figure -1 represents a plan viewthereof, with theoperating handle removed. Fig. 2 represents a vertical section of thedevice shown in Fig. 1, with the operating handle attached, taken online :1fof Fig. 1. Fig. a section taken on line 2 2 of Fig. 2. Fig. elis a section taken on line fw-fw of Fig. 2, looking upwardly. Fig. 5 isa section drawn on line @-11 of Fig. 2, and Fig. G is a diagrammaticview, showing the condenser, heating resistance, and current regulatingmechanism.

Like parts are identified by the same ref` erence numerals throughoutthe several views.

IVhile my thermo regulating` device Iis equally adapted, as stated, tobe used in connection with ay great variety of other things, for brevityof description, the same will be described as connected with a sad iron.

1 represents the smoothing core of a sad i' 4 is an operating handle ofordinary construction which is connected with the shell through thebolts 3 and 5, as more clearly Shown .in Fig. 2.

G is a heating resistance of ordinary construction by which the core lis heated.

7 represents the source of electric energy. One pole of the electriccircuit is connected with the heating resistance 6 through the conductor8, while the opposite pole is connelcted with the opposite pole of theheating resistance by the electric conductor 9, resilient plate 11,terminals 12 and 13, and electric conductors 14 and 15, whereby theelectric circuit isvcompleted between the electric supply and thelheating resistance.

It will be understood that the ,terminals 12-and 13 are normally incontact, whereby, as soon Ias the current is turned on which connectsthe generator with the heating resistance, the temperature will beraised in such heating resistance, whereby the core becomes heated. Theelectric terminal 13 is lower temperature will be required to break,

the circuit between the terminals 12 and 13, according to the degree of'pressure applied to the terminal 12. It therefore follows that when alow temperature only is required in the sad iron, the terminal 12 1sheld in yielding contact with the terminal 13 with a slight pressureonly, whereby a slight 'rise of temperature-will be sufficient to move isaid terminal 13 `out of contact with the terminal 12, when the core 1will be but slightly heated. When the terminals have been thus separatedand the temperature of the core slightly lowered, the movement of saidbar and terminal will be reversed, when the terminals will be againbrought 'into Contact. It will now be. understood that when a highervtemperature is desired, the

.terminal 12 is moved forward with increased pressure against theterminal 13 by turning forward the adjusting screw 18, when a hightemperature will be required before said plate 16 will be expanded farenough to separate said terminals,'whereby the iron or other object withwhich the heating resistance 6 is connected will be raised to a hightemperature before the electric current will be cut out. The adjustingscrew 18 is preferably yieldingly supported from the shell 2 on theresilient plate 19, and said plate 19 is connected with the shell by therivets 20, or in any other convenient manner. The plate 19 is providedwith a central aperture for the reception of the set screw 18, and saidplate is retained in place on said screw by and between the clampingnuts 21 and 22. 23 is an electric condenser of ordinary construction,and the same is connected upon one side with the branch 14 of saidelectric circuit through the branch 24, and upon the other'side with themain circuit 9 of said electric circuit through the branch 25.

By my device as heretofore constructed and as shownv in my said patent,the temperature of the sad irn is regulated by increasing oi diminishingthe resistance applied to the resilient bar 16 upon which the movableterminal 13 is supported, while by' ymy present construction, noresistance is applied to said resilient bar, but instead, the

action of such resilient bar isregulated by the-pressureof the opposingterminal 12 against the terminal 13, carried by said bar. When saidopposing terminal 12 is adjusted forwardly by 'pressure applied through.the hand screw 18, a higher temperature is required, as stated, toseparate said terminals,

and when such screw 18 is turned in the opposite direction, a lowertemperature will be required to separate such terminals. In view of thefact that a delicate adjustment -of the screw 18 is required to producethe desired results, said screw is supported, as stated, from said shell2 through the resilient member 19, and the inner end of such screw actswith yielding pressure against the resilient plate 11, through themember 26.

For convenience of operation, the respective branches 8 and 9 of theelectric circuit are insulated from each other in the ordinary manner,and inclosed in a single fabric 27, and are then preferably surroundednear their ends with a coil of wire 28, which serves as a shield forprotecting the insulating fabric. The condenser 23 is suspended from thetop of the cover by a supporting plate 28. and screws 29.

It will be understood that the resilient bar 11 is located outside oftheshell, and its movement is not affected by heat, while the resilient bar16 is located within the shell in close proximity to the heatingresistance, and it is adapted to be expanded and curved away from theother bar as the core becomes heated, and for brevity of description,the bar 11 is referred to in th'e claims as an exterior bar and the bar16 as an interior or heat actuated bar.

By referring to Fig. 2, it will be seen that the member 26 comprisesseveral parts, namely, a metallic cap 30, insulating collar 31, andscrew threaded sleeve 32. The terminal l2 is also provided on its sideswith a screw thread, and at its upper end with a notched head, and isadapted as it is turned to be adjusted longitudinally within saidthreaded sleeve 32 toward and from the terminal 13, whereby the requiredadjustment of said terminals may be provided for producing apredetermined no'rmal temperature of the device before the same isplaced upon the market. When, however, circumstances or the work to beperformed requires a higher or lower temperature, said terminals 12 and13Amay be forcedtogether with greater or less tension by the adjustmentof the screw 18, as previously described.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is-

1. ln a device of the described class, they combination with a member tobe heated, of a heating resistance carried by said mem'- ber, a sourceof electric energy, an electric circuit, the respective branches ofwhich are normally connected at one of their ends with said source ofelectrical energy and at their other end with said heating resistance, apair of electric terminals, a thermostat comprising two bars, one withinand one without the member to be heated, supporting said terminals,located in and adapted to form a part of one. of the branches of saidelectric circuit, both of said bars being supported at their respectiveends from the same insulating posts, and means for manually increasingor diminishing the pressure of the terminal carried by said exterior baragainst the opposing terminal.

2. In a device of the described class, the combination with a member tobe heated, of a heating resistance carried by said meinber, a source ofelectric energy, an electric.

circuit, the respective branches of which are normally connected at oneof their ends with said source of electrical energy and at their otherends with said heating resistance, a pair of electric terminals, athermostat comprising two bars, one within and one without .t e Amemberto be heated, supporting said terminals,l located in and adapted to forma part of one of the branchesA 3. In a device of the described class,the` combination with a-inember to be heated, of a heating resistancecarried by said member, a source of electric energy, an electriccircuit, the respective branches of which are normally connected at oneof their ends with said source of electrical energy and at their otherends with said heating resistance, a pair of electric terminals, anexterior and an interior bar supporting said terminals, located in andadapted to form a part of one of the branches of said electric circuit,'a resilient plate supported from the exterior of the body to be heated,a hand actuated screw adjustably supported from said resilient plate inclose proximity to said exterior bar, an insulating bearing interposedbetween said bar and the opposing end of said screw, said screw beingadapted,

as it is turned forward and rearward against said insulating member, toincrease and diminish the pressure of the terminal carried by saidexterior bar against the terminal carried by said interior bar, where--by the action of said interior bar is controlled and regulated withoutapplying direct resistance to its movement,

4. ln a device of the described class, the

Massei combination with a member to be heated, of a heating resistancecarried by said member, a source of electric energy, an electriccircuit, the respective'branchcs of which are normally connected at oneof their ends with said source of electrical energy and at their otherends with said heating resistance, a pair of electric terminals, anexterior and an interior bar supporting said terminals, located in andadapted to form a part of one of the branches. of said electric circuit,said bars being supported at their respective ends from insulatingposts, a hand actuated screw yieldingly supported in adjustablebearings, an insulating bearing interposed between said bar and theopposing end of said screw,said screw being adapted, as it is turnedforward and rearward against said insulating member, to increase anddiminish the pressure of the terminal carried by said exterior baragainst the terminal carried by said interior bar, whereby theaction ofsaid interior bar is controlled and regulated without applying directresistance to its movement.

5. In a device'of the described class, theV combination with a member tobe heated, of a heating resistance carried by said member, a source ofelectric energy, an electric:`

circuit, the respective branches of which are normally connected at oneof their ends with said source of electrical energy and at their otherends with said heating resistance, a pair of electric terminals, anexterior and an interior bar supporting said terminals, located in andadapted to form a part of one of the branches of said electric circuit,a pair of insulating posts, said interior and exterior bars being bothsupported at their respective ends from said insulating posts, a handactuated screw yieldingly supported in adjustable bearings, aninsulating bearing interposed between said bar and the opposing end ofsaid. screw, said screw being adapted, as it is turned forward andrearwiLLiAM A. BRAUN.

Witnesses:

W. H. KREITER, OLIVER TooMEY.

